Shutdown one or all TCP server. If force is set to false, the server will
not allow new connections, but not kill existing connections, instead it
will stop if the last connection is closed. If force is set to true,
existing connections are killed. After calling the method with
force=false, it is not possible to call it again with force=true because
new connections are not allowed. Example:

Start a web server and a browser that uses the given connection. The
current transaction is preserved. This is specially useful to manually
inspect the database when debugging. This method return as soon as the
user has disconnected.